Difference between revisions of "Automatic login to virtual console"

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{{Article summary heading|Related}}
 
{{Article summary heading|Related}}
 
{{Article summary wiki|Display Manager}}
 
{{Article summary wiki|Display Manager}}
 +
{{Article summary wiki|Silent boot}}
 
{{Article summary wiki|Start X at Login}}
 
{{Article summary wiki|Start X at Login}}
 
{{Article summary end}}
 
{{Article summary end}}
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This article describes how to automatically log in to a ''virtual console'' at the end of the [[boot process]]. This article only covers console log-ins; methods for starting an [[Xorg|X server]] are described in [[Start X at Login]].
 
This article describes how to automatically log in to a ''virtual console'' at the end of the [[boot process]]. This article only covers console log-ins; methods for starting an [[Xorg|X server]] are described in [[Start X at Login]].
  
== Service ==
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== Installation ==
Create a new service file similar to {{ic|getty@.service}} by copying it to {{ic|/etc/systemd/system/}}:
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=== Use drop-in feature of systemd for getty autologin ===
 +
[http://cgit.freedesktop.org/systemd/systemd/tree/NEWS#n655 Since systemd 198] unit files may now be extended via drop-in files without having to edit/override the unit files themselves, to learn more about this feature, consult [http://www.freedesktop.org/software/systemd/man/systemd.unit.html systemd.unit(5)] and search for ''Along with a unit file foo.service a directory foo.service.d/ may exist.''
  
# cp /usr/lib/systemd/system/getty@.service /etc/systemd/system/autologin@.service
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There are two types of consoles virtual and serial ones. In most cases you would want to setup up autologin on virtual console, the one which device name is ''ttyN'', where ''N'' is a number. The configuration of the autologin for the serial consoles will be slightly different. Device names of the serial consoles look like ''ttySN'', where ''N'' is a number.
  
{{Note|{{ic|/etc/systemd/system/}} takes precedence over {{ic|/usr/lib/systemd/system/}}.}}
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For the virtual console proceed with the following steps, the case with serial console is dealt with at the bottom of this page.
  
Then change the {{ic|ExecStart}} line to include the {{ic|-a ''USERNAME''}} parameter:
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Create a new directory named {{ic|getty@tty1.service.d}} under {{ic|/etc/systemd/system}}:
  
{{hc|/etc/systemd/system/autologin@.service|
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# mkdir /etc/systemd/system/getty@tty1.service.d
 +
 
 +
Then create a new file named {{ic|autologin.conf}} and add it into the directory:
 +
 
 +
{{hc|/etc/systemd/system/getty@tty1.service.d/autologin.conf|
 
2=[Service]
 
2=[Service]
''[...]''
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ExecStart=
ExecStart=-/sbin/agetty --noclear -a ''USERNAME'' %I 38400
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ExecStart=-/usr/bin/agetty --autologin <username> --noclear %I 38400 linux
''[...]''
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}}
  
[Install]
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{{Tip|The option {{ic|1=Type=idle}} will delay the execution of agetty until all jobs (state change requests to units) are completed. On the other hand it may cause systemd boot-up messages to pollute the login prompt. This option is more useful when [[Start X at Login|starting X automatically]]. See {{ic|man systemd.service}} for more info.}}
WantedBy=getty.target
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 +
By default, {{ic|getty@.service}} uses {{ic|1=Type=idle}}. If you want to use {{ic|1=Type=simple}}, then your {{ic|autologin.conf}} should look like this:
 +
 
 +
{{hc|/etc/systemd/system/getty@tty1.service.d/autologin.conf|
 +
2=[Service]
 +
ExecStart=
 +
ExecStart=-/usr/bin/agetty --autologin <username> --noclear %I 38400 linux
 +
Type=simple
 
}}
 
}}
  
{{Tip|It is possible to change {{ic|1=Type=idle}} to {{ic|1=Type=simple}} and avoid delaying the execution of agetty until all jobs (state change requests to units) are completed. This option is more useful when [[Start X at Login|starting X automatically]]. See {{ic|man systemd.service}} for more info. {{Note|{{ic|1=Type=simple}} can cause systemd boot-up messages to pollute the login prompt.}}}}
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In the case of a serial console you need to create different directory
  
Finally, you need to disable the old {{ic|getty@tty''X''.service}} for the specified tty and enable the new {{ic|autologin@tty''X''.service}}. For example,
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# mkdir /etc/systemd/system/serial-getty@ttyS0.service.d
# systemctl daemon-reload
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# systemctl disable getty@''tty1''
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# systemctl enable autologin@''tty1''
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# systemctl start autologin@''tty1''
+
  
{{Warning|If you are currently in an X session on the same tty configured in the service file, starting {{ic|autologin@tty''X''.service}} will kill your X server.}}
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The file {{ic|autologin.conf}} will also look slightly different
  
To avoid errors related to display-manager.service in dmesg, you should set the default target to multi-user instead of graphical:
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{{hc|/etc/systemd/system/serial-getty@ttyS0.service.d/autologin.conf|
 +
2=[Service]
 +
ExecStart=
 +
ExecStart=-/sbin/agetty --autologin <username> -s %I 115200,38400,9600 vt102
 +
Type=simple
 +
}}
 +
 
 +
== Tips & Tricks ==
 +
 
 +
=== Avoiding unnecessary dmesg errors ===
 +
To avoid errors related to {{ic|display-manager.service}} in dmesg, you should set the default target to multi-user instead of graphical:
 
  # systemctl enable multi-user.target
 
  # systemctl enable multi-user.target
(See also: [[Systemd#Change_default_target_to_boot_into|Change default runlevel/target to boot into]].)
+
 
 +
==See also==
 +
* [[Systemd#Change_default_target_to_boot_into|Change default runlevel/target to boot into]].

Revision as of 20:20, 22 September 2013

Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary end

This article describes how to automatically log in to a virtual console at the end of the boot process. This article only covers console log-ins; methods for starting an X server are described in Start X at Login.

Installation

Use drop-in feature of systemd for getty autologin

Since systemd 198 unit files may now be extended via drop-in files without having to edit/override the unit files themselves, to learn more about this feature, consult systemd.unit(5) and search for Along with a unit file foo.service a directory foo.service.d/ may exist.

There are two types of consoles virtual and serial ones. In most cases you would want to setup up autologin on virtual console, the one which device name is ttyN, where N is a number. The configuration of the autologin for the serial consoles will be slightly different. Device names of the serial consoles look like ttySN, where N is a number.

For the virtual console proceed with the following steps, the case with serial console is dealt with at the bottom of this page.

Create a new directory named getty@tty1.service.d under /etc/systemd/system:

# mkdir /etc/systemd/system/getty@tty1.service.d

Then create a new file named autologin.conf and add it into the directory:

/etc/systemd/system/getty@tty1.service.d/autologin.conf
[Service]
ExecStart=
ExecStart=-/usr/bin/agetty --autologin <username> --noclear %I 38400 linux
Tip: The option Type=idle will delay the execution of agetty until all jobs (state change requests to units) are completed. On the other hand it may cause systemd boot-up messages to pollute the login prompt. This option is more useful when starting X automatically. See man systemd.service for more info.

By default, getty@.service uses Type=idle. If you want to use Type=simple, then your autologin.conf should look like this:

/etc/systemd/system/getty@tty1.service.d/autologin.conf
[Service]
ExecStart=
ExecStart=-/usr/bin/agetty --autologin <username> --noclear %I 38400 linux
Type=simple

In the case of a serial console you need to create different directory

# mkdir /etc/systemd/system/serial-getty@ttyS0.service.d

The file autologin.conf will also look slightly different

/etc/systemd/system/serial-getty@ttyS0.service.d/autologin.conf
[Service]
ExecStart=
ExecStart=-/sbin/agetty --autologin <username> -s %I 115200,38400,9600 vt102
Type=simple

Tips & Tricks

Avoiding unnecessary dmesg errors

To avoid errors related to display-manager.service in dmesg, you should set the default target to multi-user instead of graphical:

# systemctl enable multi-user.target

See also